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Optimize folding for audio rate

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Aria 2025-09-10 21:27:56 -05:00
parent 9b1c23d49f
commit 51b150b829
1 changed files with 4 additions and 4 deletions
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8
packages/superdough/helpers.mjs
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@ -311,17 +311,17 @@ export function applyFM(param, value, begin) {
// Saturation curves
const __squash = (x) => x / (1 + x); // [0, inf) to [0, 1)
const _mod = (n, m) => ((n % m) + m) % m;
const _scurve = (x, k) => ((1 + k) * x) / (1 + k * Math.abs(x));
const _soft = (x, k) => Math.tanh(x * (1 + k));
const _hard = (x, k) => clamp((1 + k) * x, -1, 1);
const _fold = (x, k) => {
// Closed form folding for audio rate
let y = (1 + 0.5 * k) * x;
while (y > 1 || y < -1) {
y = y > 1 ? 2 - y : -2 - y;
}
return y;
const window = _mod(y + 1, 4);
return 1 - Math.abs(window - 2);
};
const _sineFold = (x, k) => Math.sin((Math.PI / 2) * _fold(x, k));